jisuanqi.java

简易计算器 加减乘除轻松解决 欢迎参考学习

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


 class Compute {
	
	//声明组件
	private static JFrame ff;
	private static JPanel pan1;
	
	JButton b1;
	JButton b2;
	JButton b3;
	JButton b4;
	
	JTextField text1;
	JTextField text2;
	
	JLabel l;
	JLabel l1;
	JLabel l2;
	
	
	public Compute()  //建立界面
 	{
	
		//面板
		pan1=new JPanel();
		pan1.setSize(284, 182);
		pan1.setBackground(Color.BLUE);
		
		//加法按钮
		b1=new JButton("+");
		b1.setBounds(new Rectangle(216, 11, 55, 19));
		b1.setBackground(Color.pink);
		b1.addActionListener(new addAction());
		//减法按钮       
	    b2=new JButton("-");
		b2.setBounds(new Rectangle(216, 38, 55, 19));
		b2.setBackground(Color.pink);
		b2.addActionListener(new jianAction());
		//乘法按钮       
	    b3=new JButton("*");
		b3.setBounds(new Rectangle(216, 65, 55, 19));
		b3.setBackground(Color.pink);
		b3.addActionListener(new chengAction());
		//除法按钮       
		b4=new JButton("/");
		b4.setBounds(new Rectangle(216, 92, 55, 19));
		b4.setBackground(Color.pink);
		b4.addActionListener(new chuAction());
		
		//文本框
		text1=new JTextField();
		text1.setBounds(new Rectangle(84, 26, 118, 22));
		text2=new JTextField();
		text2.setBounds(new Rectangle(84, 62, 118, 22));
		//标签
		l= new JLabel();
		l.setBounds(new Rectangle(9, 98, 193, 22));
		l.setText("");		
		l1=new JLabel();
		l1.setBounds(new Rectangle(9, 26, 55, 22));
		l1.setText("操作数1");
		l2 = new JLabel();
		l2.setBounds(new Rectangle(9, 62, 55, 22));
		l2.setText("操作数2");
		
		//添加组件
		pan1.setLayout(null);       
		pan1.add(b1);
		pan1.add(b2);
		pan1.add(b3);
		pan1.add(b4);
		pan1.add(text1);
		pan1.add(text2);
		pan1.add(l);
		pan1.add(l1);
		pan1.add(l2);
	}
	public static void main(String args[]){
	
		
		Compute c=new Compute(); //新建组件
		ff=new JFrame("简易计算器"); //新建框架
		ff.setSize(284, 182);
		ff.setLocation(500,400);
		ff.setLayout(null);
		ff.getContentPane().add(pan1);
		ff.setVisible(true);       
		ff.addWindowListener(new WindowAdapter() { 
		             public void windowClosing(WindowEvent e) 
		              {System.exit(0);} });    // 处理关闭事件的通常方法 
	}
	
	//事件处理方法类
	private class addAction implements ActionListener  //加法事件
	{
		public void actionPerformed(ActionEvent e)
		{
			double temp=0.0;
			double temp1=0.0;
			double sum=0.0;
			String s=new String();
			temp =Double.parseDouble(text1.getText());
			temp1 =Double.parseDouble(text2.getText());
			sum =temp+temp1;
			s=Double.toString(sum);
			l.setText(s);	
		}
	}
	private class jianAction implements ActionListener  //减法事件
	{
		public void actionPerformed(ActionEvent e)
		{
			double temp=0.0;
			double temp1=0.0;
			double sum=0.0;
			String s=new String();
			temp =Double.parseDouble(text1.getText());
			temp1 =Double.parseDouble(text2.getText());
			sum =temp-temp1;
			s=Double.toString(sum);
			l.setText(s);
		}
	}
	private class chengAction implements ActionListener  //乘法事件
	{
		public void actionPerformed(ActionEvent e)
		{
			double temp=0.0;
			double temp1=0.0;
			double sum=0.0;
			String s=new String();
			temp =Double.parseDouble(text1.getText());
			temp1 =Double.parseDouble(text2.getText());
			sum =temp*temp1;
			s=Double.toString(sum);
			l.setText(s);		
		}
	}
	private class chuAction implements ActionListener   //除法事件
   	{
   		public void actionPerformed(ActionEvent e)
   		{
                                                   //建立 临时存储操作数1,2 和最终结果 的3个变量 
   			double temp=0.0;
   			double temp1=0.0;
   			double sum=0.0;
   			String s=new String();   //临时转换的字符变量
   			temp =Double.parseDouble(text1.getText());  //获取操作数1 并转换成double型
   			temp1 =Double.parseDouble(text2.getText());  //获取操作数2 并转换成double型
   			if(temp1==0) l.setText("除数不能为0");   //判断操作数2是否为0
   			else
   			{
			sum =temp/temp1;
			s=Double.toString(sum);
			l.setText(s);   //显示结果的标签设置最终的结果
   			}   			
   		}
   	}
}